A tangential permanent magnet motor rotor structure

Abstract

The utility model relates to permanent magnet motor technical field, concretely relates to a tangential permanent magnet motor rotor structure, including rotor core, rotor core includes the yoke part of setting in the center of rotor core and the multiple magnetic pole units of setting along the radial direction of rotor core evenly, the two magnetic pole units between adjacent are provided with the placement slot, the placement slot includes the main magnetic steel groove of setting away from yoke part and the vice magnetic steel groove of setting close to yoke part, the main magnetic steel groove and vice magnetic steel groove are equipped with the main magnetic steel body and vice magnetic steel body matched with it respectively in, the main magnetic steel body and vice magnetic steel body are respectively residual magnetism high body and residual magnetism low body, the width a of main magnetic steel body is less than the width c of vice magnetic steel body, the center line of magnetic pole unit is provided with main magnetic barrier, and main magnetic barrier is located in the one side of the position of main magnetic steel body and vice magnetic steel body contact, and the main magnetic steel body and vice magnetic steel body of this rotor structure adopt unequal width design and cooperate main magnetic barrier, can effectively reduce the leakage of magnetic steel, and the utilization rate of magnetic steel is promoted.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet motor technology, and in particular to a tangential permanent magnet motor rotor structure. Background Technology

[0002] Permanent magnet motors are a type of motor that does not require excitation coils or excitation current. They generate a permanent magnet magnetic field using permanent magnets, are highly efficient, and have a simple structure. With the continuous improvement of the performance of permanent magnet materials and the development of motor technology, permanent magnet motors have been widely used in various industries.

[0003] Traditional permanent magnet motors typically employ a surface-mounted rotor structure, where magnets are bonded to the surface of the rotor core. Since the relative permeability of the magnets is close to that of air, the surface-mounted rotor structure results in a large effective air gap and low air gap flux. To improve the power density and torque density of the motor, permanent magnet motors usually adopt an embedded rotor structure, where magnets are bonded inside the rotor core. This effectively reduces the effective air gap, increases the air gap flux, and thus improves motor performance.

[0004] Existing embedded permanent magnet motors, especially those with tangentially magnetized rotor structures, can effectively increase the air gap flux by utilizing the "magnetic focusing effect" of parallel magnetic circuits. However, there is severe magnetic leakage at both ends of the magnets in this structure, resulting in low utilization of the permanent magnets. Summary of the Invention

[0005] In view of this, the purpose of this utility model is to propose a tangential permanent magnet motor rotor structure to solve the problem of low utilization rate of permanent magnets.

[0006] Based on the above objectives, this utility model provides a tangential permanent magnet motor rotor structure, including a rotor core. The rotor core includes a yoke disposed at the center of the rotor core and a plurality of magnetic pole units uniformly arranged along the radial direction of the rotor core. The magnetic pole units surround the yoke. A placement slot is provided between two adjacent magnetic pole units. The placement slot includes a main magnet slot disposed away from the yoke and a secondary magnet slot disposed close to the yoke. The main magnet slot and the secondary magnet slot are respectively provided with matching main magnet bodies and secondary magnet bodies. The main magnet body and the secondary magnet body are respectively a high remanence body and a low remanence body. The width 'a' of the main magnet body is smaller than the width 'c' of the secondary magnet body. A main magnetic barrier is provided on the center line of the magnetic pole unit. The main magnetic barrier is located on one side of the contact position between the main magnet body and the secondary magnet body.

[0007] Optionally, a magnetic support connected to the yoke is provided between two adjacent magnetic pole units to support the auxiliary magnetic steel body.

[0008] Optionally, the height b of the main magnet is greater than the height d of the auxiliary magnet.

[0009] Optionally, a secondary magnetic barrier is provided on the center line of the magnetic pole unit near the yoke, and the magnetic pole unit and the yoke are connected by a magnetic isolation bridge.

[0010] Optionally, the distance w1 between the main magnet and the main magnetic barrier is greater than the distance w2 between the auxiliary magnet and the main magnetic barrier.

[0011] Optionally, the distance w3 between the secondary magnet and the secondary magnetic barrier is less than the width w4 of the magnetic isolation bridge.

[0012] Optionally, the main magnet and the auxiliary magnet are respectively a neodymium iron boron magnet with high remanence and a ferrite magnet with low remanence.

[0013] The beneficial effects of this utility model are as follows: This utility model provides a tangential permanent magnet motor rotor structure. The rotor structure has a main magnet and an auxiliary magnet arranged between two adjacent magnetic pole units of the rotor core. The main magnet and the auxiliary magnet are respectively the high remanence body and the low remanence body. The main magnet and the auxiliary magnet adopt an unequal width design and cooperate with the main magnetic barrier, which can effectively reduce the magnetic leakage of the magnet and improve the utilization rate of the magnet. The width 'a' of the main magnet is smaller than the width 'c' of the auxiliary magnet, ensuring that the main magnetic circuit is larger than the auxiliary magnetic circuit, so that more effective magnetic circuits can be followed. The auxiliary magnet assists the main magnet, effectively reducing the magnetic leakage at the end of the main magnet and improving the overall utilization rate of the magnet. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the rotor core of this utility model;

[0017] Figure 3 This is a schematic diagram showing a partial structural detail of the present invention.

[0018] In the diagram: 1. Rotor core; 11. Main magnet slot; 12. Secondary magnet slot; 13. Magnetic pole unit; 131. Main magnetic barrier; 132. Secondary magnetic barrier; 14. Magnet support; 15. Magnetic isolation bridge; 16. Yoke; 2. Main magnet body; 3. Secondary magnet body. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] like Figures 1 to 3 As shown, a tangential permanent magnet motor rotor structure includes a rotor core 1. The rotor core 1 includes a yoke 16 disposed at the center of the rotor core 1 and a plurality of magnetic pole units 13 uniformly arranged along the radial direction of the rotor core 1. The magnetic pole units 13 surround the yoke 16. A placement groove is provided between two adjacent magnetic pole units 13. The placement groove includes a main magnet slot 11 disposed away from the yoke 16 and a secondary magnet slot 12 disposed close to the yoke 16. A main magnet body 2 and a secondary magnet body 3 are respectively provided in the main magnet slot 11 and the secondary magnet slot 12. The main magnet body 2 and the secondary magnet body 3 are respectively a high remanence body and a low remanence body. The width a of the main magnet body 2 is smaller than the width c of the secondary magnet body 3. A main magnetic barrier 131 is provided on the center line of the magnetic pole unit 13. The main magnetic barrier 131 is located on one side of the contact position between the main magnet body 2 and the secondary magnet body 3.

[0022] The rotor structure incorporates a main magnet 2 and an auxiliary magnet 3 between two adjacent magnetic pole units 13 of the rotor core 1. The main magnet 2 and the auxiliary magnet 3 are respectively a high remanence body and a low remanence body. The main magnet 2 and the auxiliary magnet 3 are designed with unequal widths and work in conjunction with the main magnetic barrier 131 to effectively reduce magnetic leakage and improve the utilization rate of the magnets. The width 'a' of the main magnet 2 is smaller than the width 'c' of the auxiliary magnet 3, ensuring that the main magnetic circuit is larger than the auxiliary magnetic circuit, allowing for more effective magnetic paths. The auxiliary magnet 3 assists the main magnet 2, effectively reducing magnetic leakage at the end of the main magnet 2 and improving the overall utilization rate of the magnets.

[0023] A magnetic support 14 for supporting the auxiliary magnetic steel body 3 is provided between two adjacent magnetic pole units 13 and connected to the yoke 16. The magnetic support 14 provides high mechanical strength, reasonable structure and simple manufacturing process.

[0024] The height b of the main magnet 2 is greater than the height d of the auxiliary magnet 3. Since a is less than c and b is greater than d, the main magnetic circuit is larger than the auxiliary magnetic circuit, allowing for more effective magnetic paths. The volume of the main magnet 2 is smaller than the volume of the auxiliary magnet 3, and the ratio of the amount of the main magnet 2 to the amount of the auxiliary magnet 3 is appropriate.

[0025] A secondary magnetic barrier 132 is provided on the center line of the magnetic pole unit 13 near the yoke 16, and the magnetic pole unit 13 and the yoke 16 are connected by a magnetic isolation bridge 15.

[0026] The distance w1 between the main magnetic steel body 2 and the main magnetic barrier 131 is greater than the distance w2 between the secondary magnetic steel body 3 and the main magnetic barrier 131. Since w1 is greater than w2, the main magnetic circuit is larger than the secondary magnetic circuit. The effective magnetic circuit generated by the main magnetic steel body 2 passes through w1 first. Since w1 is greater than w2, an effective magnetic circuit can be reserved for the secondary magnetic steel body 3, and the first part of the magnetic circuit of the secondary magnetic steel body 3 is effectively utilized.

[0027] The distance w3 between the auxiliary magnet 3 and the auxiliary magnetic barrier 132 is less than the width w4 of the magnetic isolation bridge 15. Since w3 is less than w4, the effective magnetic circuit at the bottom of the auxiliary magnet 3 is narrowed, while ensuring the width of the magnetic pole unit 13 and the yoke 16. Overall, the auxiliary magnet 3 assists the main magnet 2, effectively reducing the magnetic leakage at the end of the main magnet 2 and improving the overall utilization rate of the magnet.

[0028] The main magnet 2 and the auxiliary magnet 3 can be neodymium iron boron magnets with high remanence and ferrite magnets with low remanence, respectively. The main magnet 2 is made of neodymium iron boron material with high remanence, which exhibits high magnetic field strength. The auxiliary magnet 3 is made of ferrite material with low remanence. High remanence neodymium iron boron has low content and high price, while low remanence ferrite has high content and low price. The presence of the auxiliary magnet 3 improves the utilization rate of the main magnet 2, reduces costs, and is more economical.

[0029] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0030] The embodiments of this utility model are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A tangential permanent magnet motor rotor structure comprising a rotor core, characterized by, The rotor core includes a yoke located at the center of the rotor core and a plurality of magnetic pole units uniformly arranged along the radial direction of the rotor core. The magnetic pole units surround the yoke, and a placement slot is provided between two adjacent magnetic pole units. The placement slot includes a main magnet slot located away from the yoke and a secondary magnet slot located close to the yoke. The main magnet slot and the secondary magnet slot are respectively provided with matching main magnet bodies and secondary magnet bodies. The main magnet body and the secondary magnet body are respectively a high remanence body and a low remanence body. The width 'a' of the main magnet body is smaller than the width 'c' of the secondary magnet body. A main magnetic barrier is provided on the center line of the magnetic pole unit. The main magnetic barrier is located on one side of the contact position between the main magnet body and the secondary magnet body.

2. A tangential permanent magnet motor rotor structure according to claim 1, characterized in that, A magnetic support for supporting the secondary magnet is provided between two adjacent magnetic pole units and connected to the yoke.

3. A tangential permanent magnet motor rotor structure according to claim 1, characterized in that, The height b of the main magnet is greater than the height d of the auxiliary magnet.

4. A tangential permanent magnet motor rotor structure according to claim 1, characterized in that, A secondary magnetic barrier is provided on the center line of the magnetic pole unit near the yoke, and the magnetic pole unit and the yoke are connected by a magnetic isolation bridge.

5. A tangential permanent magnet motor rotor structure according to claim 4, characterized in that, The distance w1 between the main magnet and the main magnetic barrier is greater than the distance w2 between the auxiliary magnet and the main magnetic barrier.

6. A tangential permanent magnet motor rotor structure according to claim 5, characterized in that, The distance w3 between the secondary magnet and the secondary magnetic barrier is less than the width w4 of the magnetic isolation bridge.

7. A tangential permanent magnet motor rotor structure according to claim 1, characterized in that, The main magnet and the auxiliary magnet are neodymium iron boron magnets with high remanence and ferrite magnets with low remanence, respectively.

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